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The delay_half parameter must be specified by the port to set up the timing of the software SPI. This allows the port to adjust the timing value to better suit its timing characteristics, as well as provide a more accurate printing of the baudrate.
56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_EXTMOD_MACHINE_SPI_H
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#define MICROPY_INCLUDED_EXTMOD_MACHINE_SPI_H
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#include "py/obj.h"
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#include "py/mphal.h"
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// SPI protocol
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typedef struct _mp_machine_spi_p_t {
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void (*transfer)(mp_obj_base_t *obj, size_t len, const uint8_t *src, uint8_t *dest);
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} mp_machine_spi_p_t;
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typedef struct _mp_machine_soft_spi_obj_t {
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mp_obj_base_t base;
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uint32_t delay_half; // microsecond delay for half SCK period
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uint8_t polarity;
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uint8_t phase;
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mp_hal_pin_obj_t sck;
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mp_hal_pin_obj_t mosi;
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mp_hal_pin_obj_t miso;
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} mp_machine_soft_spi_obj_t;
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void mp_machine_soft_spi_transfer(mp_obj_base_t *self, size_t len, const uint8_t *src, uint8_t *dest);
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MP_DECLARE_CONST_FUN_OBJ(mp_machine_spi_read_obj);
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MP_DECLARE_CONST_FUN_OBJ(mp_machine_spi_readinto_obj);
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MP_DECLARE_CONST_FUN_OBJ(mp_machine_spi_write_obj);
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MP_DECLARE_CONST_FUN_OBJ(mp_machine_spi_write_readinto_obj);
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#endif // MICROPY_INCLUDED_EXTMOD_MACHINE_SPI_H
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